SPEEDBALL-Linseed Oil. Mona Lisa's Boiled Linseed Oil is a drying oil extract from the flax plant seed and processed with special additives which shorten its drying time to 12 to 18 hours depending on heat and humidity levels. It is an excellent choice as an extender and fortifier of oil base paints stains and primers. It assures a uniformly tough; elastic and glossy film that repels water; resists weather; retards chalking and prolongs paint film life. This package contains one 8oz/236.5ml can with a replaceable; child-proof cap. Made in USA.